Today, most people can check the time with a glance at a phone, watch, or computer screen. Precise timekeeping has become so routine that it's easy to forget how difficult it once was to measure the ...

(Editor's note: Sis Hause is taking a couple of weeks off from her column. She and Lynn Reichen wrote the following several years ago.) As with all inventors, Mr. Henry Rempe had a great idea. His ...

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Researchers have designed a quantum version of a pendulum clock. It could shed light on timekeeping in the quantum realm ...